Systematic notes on Burdigalian Echinoids from the Qom Formation in the Bagher Abad area, Central Iran

Document Type: Research Paper

Authors

1 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Iran

2 Department of Geology, Faculty of Science of Isfahan, Iran

Abstract

Echinoids fauna are common and distributed in the Lower Miocene deposits of the Bagher Abad area, northeast Isfahan, Central Iran.
There are six Echinoid taxa belonging to the Echinoidea Class that can be described as: Clypeaster intermedius, Prinocidaris sp. and
spines related to: Eucidaris zaemays, Stylocidaris Polyacantha, Spatangoid sp. and Prinocidaris sp. Bivalves, Foraminifers,
Bryozoans, Brachiopods, scatter fragment of Crabs and Corals can obviously be seen in this section. The presence of Echinoids and
Bivalves fauna indicated that, the shallow and warm water environment was dominated by them in Central Iran at the Lower Miocene
(Burdigalian). From a palaeobiogeographic point of view, the fauna from the Qom Formation were similar to the West and Central
parts of the Paratethys and confirmed that, the Bagher Abad area was located in the marginal seaways, which connected the West,
Central Paratethys and Indo-pacific Ocean at that time (Lower Miocene).

Keywords


Article Title [Persian]

ساختارها و سیستماتیک اکینودرم های سازند قم (بوردیگالین) از منطقه باقر آباد، ایران مرکزی

Authors [Persian]

  • مریم نورالدینی 1
  • مهدی یزدی 2
  • علیرضا عاشوری 1
1 گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، ایران
2 گروه زمین شناسی، دانشکده علوم، دانشگاه اصفهان، ایران
Abstract [Persian]

جنس و گونه های مختلفی از فسیل خارپوستان در نهشته های میوسن اغازین منطقه باقر آباد (شمال شرق اصفهان)، ایران مرکزی دیده می شوند. تعداد شش گونه وابسته به اکینید ها در این رسوبات شناسایی شده ، که شامل
Clypeaster intermedius, Prinocidaris? sp. and spines: Eucidaris zaemays, Stylocidaris? Polyacantha, Spatangoid sp. and Prionocidaris sp
است. گروه هایی همچون دوکفه ای ها، فرامینیفر ها، بریوزوا، براکیوپود ها، بقایای خرچنگ ها و مرجان ها نیز به وفور در این رسوبات دیده می شود. بر اساس حضور خارپوستان و براکیوپود ها سن بوردیگالین برای این بخش در نظر گرفته می شود. حضور این مجموعه گروه های فسیلی گویای یک محیط کم عمق و گرم در این زمان در ایران مرکزی بوده است. قرابت گروه های فسیلی بدست امده از این منطقه (سازند قم) با پاراتتیس گویای یک ارتباط آبی در آن زمان (بوردیگالین) می باشد. از طرفی شباهت این گروه های فسیلی با اقیانوس های هند و آرام نیز تاکیدی بر ارتباط آبی بین مدیترانه تا هند از طریق ایران در آن زمان بوده است.
.

Keywords [Persian]

  • میوسن زیرین
  • اکینوئید
  • سازند قم
  • ایران مرکزی
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